Home Crop Monitoring Pulse School: Seed early to get a jump on root rots

Pulse School: Seed early to get a jump on root rots


What can growers do, proper now, to assist scale back the devastating results pathogens, equivalent to aphanomyces and fusarium, have on pulse crops?

Michael Wunsch, plant pathologist with North Dakota State College, joins Kara Oosterhuis for this Pulse Faculty episode to discuss waht is and isn’t in farmers’ management.

Wunsch’s strategy to illness administration consists of sensible and utilized analysis and goals to present practices that farmers can implement “tomorrow.”

For fusarium and aphanomyces root rot, Wunsch has researched the return on funding for a fungicide seed therapy, and the impression soil temperature has on the effectiveness of those remedies. He’s additionally measured the impression of planting date.

“We know fusarium and aphanomyces are warm-temperature pathogens, and we had seen, anecdotally, that planting early seemed to reduce the root rot severity of these diseases,” says Wunsch.

Wunsch and his analysis staff additionally checked out using crop rotation, which looks as if a no brainer (and is the highest suggestion for administration, nonetheless), however fusarium and aphanomyces are notoriously long-lived in soils, so there could also be extra technique to apply than simply rotation.

Catch the total dialog for extra particulars on the analysis strategies, together with planting dates and experimental design in addition to key findings:

Widening crop rotations was additionally a a part of Wunsch’s earlier work at websites with and with out earlier histories of fusarium and aphanomyces in peas. He examined two, three, 4, and 6 yr rotations, evaluating the info between the rotations.

“Soil temperature is the key here when it comes to planting date and how to optimize field pea agronomy performance,” says Wunsch.

Wunsch explains that  root rot severity was much less when the soil temperature was beneath 10 levels C within the week after planting, at seeding depth, however emergence was very poor when temperatures have been beneath 7.5 levels C.

“The sweet spot for yield, where you maximize your yield, i.e. you reduce your root rot, but didn’t have terrible emergence problems, was between 7.5 and 10 degrees C at that two inch depth below the soil surface,” says Wunsch.

One of many issues to bear in mind is that when planting into cool soils, and there’s a historical past of different root rot pathogens, like rhizoctonia or pythium, a fungicide seed therapy turns into crucial. As Wunsch warns although, a fungicide seed therapy and soil temperature aren’t sufficient for this combat — good crop rotation practices are additionally vital.

“When we grew peas once every six years, and used a fungicide treatment and planted early, we were getting 48 to 49 bushel peas, in a field with horrible root rot pressure,” says Wunsch. “When we planted every four years, we got 39 to 40 bushel peas with the same practices.”


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